mic lower_bound

main.dart

import 'package:collection/collection.dart';

class Mitarbeiter {
  int gehalt;
  String name;
  Mitarbeiter(this.gehalt, this.name);
}

int micLowerBound<E, V>(List<E> sortedList, V value, {int compare(E, V)?}) {
  if (compare == null) {
    return 0; // todo call standard compare
  } else {
    return compare(sortedList.first, value); // todo implement lower_bound properly
  }
}

void runLowerBounds() {
  var mList = [Mitarbeiter(50000, "karl"), Mitarbeiter(100000, "boss")];
  var m3 = Mitarbeiter(65000, "lenny");
  var i = mList.lowerBound(m3, (p0, p1) => p0.gehalt - p1.gehalt);

  // : Invalid argument: Instance of '_Type'Error: Invalid argument: Instance of '_Type'
  var i2 = micLowerBound(mList, 65000,
      compare: (mitarbeiter, gehalt) => mitarbeiter.gehalt - gehalt);
  
  print('lowerBound: $i');
  print('lowerBoundBy: $i2');
}
void main() {
  runLowerBounds();
}

The gist shows how a lower_bound could be implemented that does not need to create an object of type E just for comparison.